A large class of protozoans (phylum Apicomplexa, subkingdom Protozoa) consisting of obligatory parasites with simple spores lacking polar filaments; cilia and flagella are absent (except for microgametes, found in some groups), and locomotion is by undulation, gliding, or body flexion; sexuality, when present, is by syngamy, forming oocysts with infective sporozoites from sporogony. The class includes the gregarines and coccidia, the latter including many agents of human and animal disease, such as the plasmodia of malaria. SYN: Sporozoasida, Telosporea. [Mod. L., fr. G. sporos, seed, + zoon, animal]

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Spo·ro·zoea (spor″o-zeґə) a class of homoxenous or heteroxenous parasitic protozoa (phylum Apicomplexa) having a conoid (if present) forming a complete cone; both sexual and asexual phases; oocysts generally containing infective sporozoites that result from sporogeny; flagella in microgametes of some groups; and pseudopods (if present) used for feeding only. Locomotion of mature organisms is by means of body flexion, gliding, or undulation of longitudinal ridges on the body surface. Subclasses of medical interest are Coccidia and Piroplasmia. Called also Sporozoa.

Medical dictionary. 2011.

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  • Coccidia — A subclass of important protozoa (class Sporozoea, phylum Apicomplexa) in which the mature trophozoites are small and typically intracellular; schizogony and sporogony can occur in the same host, in contrast to the gregarines ( …   Medical dictionary

  • sporozoan — 1. An individual organism of the class Sporozoea. SYN: sporozoon. 2. Relating to the Sporozoea. * * * spo·ro·zo·an .spōr ə zō ən, .spȯr n any protozoan of the class Sporozoa sporozoan adj * * * spo·ro·zo·an (spor″o zoґə …   Medical dictionary

  • Apicomplexa — A phylum of the subkingdom Protozoa, which includes the class Sporozoea and the subclasses Coccidia and Piroplasmia, and is characterized by the presence of an apical complex. [L. apex, pl. apicis, tip, summit, + complexus, woven together] * * *… …   Medical dictionary

  • Haemosporina — A suborder of coccidia (class Sporozoea) that lack syzygy, with separate development of macrogamete and microgamont, the latter producing eight flagellated microgametes; heteroxenous with merogany in vertebrates and sporogony in bloodsucking in …   Medical dictionary

  • Piroplasmida — An order of sporozoan protozoa (subclass Piroplasmia, class Sporozoea) consisting of the families Habesiidae, Theileriidae, and Dactylosomatidae; includes heteroxenous tick borne blood parasites of vertebrates with reduced apical complex, lacking …   Medical dictionary

  • Cytauxzoonosis — Cytauxzoon felis Scientific classification Kingdom: Protista Phylum: Apicomplexa Class: Sporozoea Order …   Wikipedia

  • СПОРОВИКИ — (Sporozoea), класс паразитич. простейших. Произошли, вероятно, от жгутиконосцев. В организм хозяев попадают обычно в виде расселительных стадий (спорозоитов или мерозоитов). 3 подкласса: грегарины, кокцидии и пироплазмиды; С. рассматривают также… …   Биологический энциклопедический словарь

  • Babesiidae — A family of protozoan parasites (class Sporozoea, order Piroplasmida) occurring in the red blood cells of various mammals. The organisms are piriform, round, or oval and reproduce by schizogony to form tetrads or by …   Medical dictionary

  • coccidia — Plural of coccidium. * * * coc·cid·ia käk sid ē ə n pl 1) cap a large order of schizogonic telosporidian sporozoans typically parasites of the digestive epithelium of vertebrates and higher invertebrates and including several forms of great… …   Medical dictionary

  • Encephalitozoon — A genus of protozoan parasites, formerly considered part of the family Toxoplasmatidae, class Sporozoea, but now recognized as a member of the protozoan phylum Microspora, family …   Medical dictionary

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